Bicycle MechanicsBroken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

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There shouldn't be any real issue, since the slightly wider chain will certainly run on the rings. There might (that's might as in maybe, but probably not) be some reduction in available angle to smaller cassette sprockets from the inner ring. That means you might not be able to ride crossed over 39/11 or 12. That shouldn't be an issue since you probably use these combinations anyway.

I don't understand the kool aid comment.
Just looking to upgrade cranks.

fietsbob tends to be a bit cryptic and often more confusing than helpful. Apparently he means that Campy will say you need a complete 11-speed drivetrain to go with the 11-speed crank. I.e. you are expected to drink the company's Kool Aid and buy the entire group.

If you have rubbing problems with the 10-speed chain you might have to go to an 11-speed chain but that should work fine with the remaining 10-speed components. The downside is that only Campy makes an 11-speed chain and you need an expensive Park chain tool or an absurdly expensive Campy chain tool to install it.